Microsoft 365 Email ((NEW)) Download

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Access email, store and share files, communicate with your coworkers or students, schedule meetings, track your to-do lists and more by integrating applications and downloading them on up to five devices.

Microsoft 365 Email Download

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UPDATE: Microsoft performed a comprehensive technical investigation into the acquisition of the Microsoft account consumer signing key, including how it was used to access enterprise email. Our technical investigation has concluded, and on September 6, 2023, we published our investigation findings.

Microsoft has mitigated an attack by a China-based threat actor Microsoft tracks as Storm-0558 which targeted customer emails. Storm-0558 primarily targets government agencies in Western Europe and focuses on espionage, data theft, and credential access. Based on customer reported information on June 16, 2023, Microsoft began an investigation into anomalous mail activity. Over the next few weeks, our investigation revealed that beginning on May 15, 2023, Storm-0558 gained access to email accounts affecting approximately 25 organizations in the public cloud including government agencies as well as related consumer accounts of individuals likely associated with these organizations. They did this by using forged authentication tokens to access user email using an acquired Microsoft account (MSA) consumer signing key. Microsoft has completed mitigation of this attack for all customers.

Our telemetry indicates that we have successfully blocked Storm-0558 from accessing customer email using forged authentication tokens. No customer action is required. As with any observed nation-state actor activity, Microsoft has contacted all targeted or compromised organizations directly via their tenant admins and provided them with important information to help them investigate and respond. We continue to work closely with these organizations. If you have not been contacted, our investigations indicate that you have not been impacted.

Microsoft investigations determined that Storm-0558 gained access to customer email accounts using Outlook Web Access in Exchange Online (OWA) and Outlook.com by forging authentication tokens to access user email.

Each device or application must be able to authenticate with Microsoft 365 or Office 365. The email address of the account that's used to authenticate with Microsoft 365 or Office 365 will appear as the sender of messages from the device or application.

Enter the following settings directly on your device or in the application as their guide instructs (it might use different terminology than this article). As long as your scenario meets the requirements for SMTP AUTH client submission, the following settings will enable you to send emails from your device or application:

For more information about configuring your own email server to send mail to Microsoft 365 or Office 365, see Set up connectors to route mail between Microsoft 365 or Office 365 and your own email servers.

For information about TLS, see How Exchange Online uses TLS to secure email connections and for detailed technical information about how Exchange Online uses TLS with cipher suite ordering, see TLS cipher suites supported by Office 365.

If the printer or application wants to send emails from a different account, the sign-in account should have Send As permission over that account. Otherwise, the result is an error similar to:

You want your device or application to send from each user's email address and don't want each user's mailbox credentials configured to use SMTP client submission. Direct send allows each user in your organization to send emails using their own address.

You want to send bulk emails or newsletters. Microsoft 365 or Office 365 doesn't allow you to send bulk messages via SMTP AUTH client submission. Direct send allows you to send a higher volume of messages.

There is a risk of your email being marked as spam by Microsoft 365 or Office 365. You might want to enlist the help of a bulk email provider to assist you. For example, they'll help you adhere to best practices, and can help ensure that your domains and IP addresses aren't blocked by others on the internet.

This IP address will be authorized to send on your domain's behalf. Anyone with access to it could send emails to any external recipient and it would pass SPF checking. You should consider carefully who has access to use this IP address.

The application or device in your organization's network uses direct send and your Microsoft 365 or Office 365 mail exchange (MX) endpoint to send emails to recipients in your organization. It's easy to find your MX endpoint in Microsoft 365 or Office 365 if you need to look it up.

You can configure your device to send emails directly to Microsoft 365 or Office 365. Use direct send method to send email to recipients with Microsoft 365 or Office 365 mailboxes in your organization. If your device uses direct send to try to relay an email for a recipient who doesn't have a Microsoft 365 or Office 365 mailbox, the email will be rejected.

If your device or application has the ability to act as an email server to deliver messages to Microsoft 365 or Office 365 and to other email providers, there are no Microsoft 365 or Office 365 settings needed for this scenario. For more information, see your device or application instructions.

SMTP relay lets Microsoft 365 or Office 365 relay emails on your behalf by using a connector that's configured with a TLS certificate (recommended) or your public IP address. Setting up a connector makes this option more complicated.

Once you choose Your organization's email server from the Connection from drop-down, Office 365 is automatically chosen from the Connection to drop-down.

On the Authenticating sent email page, select the first option to use the subject name on the certificate of the sending server to authenticate with Office 365. The domain name in the option should match the CN or SAN in the certificate used by your server, device, or application.

Check that the domains that the application or device will send to have been verified. If the domain isn't verified, emails could be lost, and you won't be able to track them with the Exchange Online message trace tool.

Now that you're done with configuring your Microsoft 365 or Office 365 settings, go to your domain registrar's website to update your DNS records. Edit your SPF record. Include the IP address that you noted in step 1. The finished string should look similar to this v=spf1 ip4:10.5.3.2 include:spf.protection.outlook.com ~all, where 10.5.3.2 is your public IP address. Skipping this step can cause emails to be sent to recipient Junk Email folders.

The Microsoft 365 or Office 365 connector that you configure authenticates your device or application with Microsoft 365 or Office 365 using an IP address. Your device or application can send emails using any address (including ones that can't receive emails), as long as the address uses one of your domains. It's not mandatory for the email address to be associated with an actual mailbox. For example, if your domain is contoso.com, you could send from an address like do_not_reply@contoso.com.

Microsoft 365 or Office 365 SMTP relay uses a connector to authenticate the emails sent from your device or application. This authentication method allows Microsoft 365 or Office 365 to relay those messages to your own mailboxes and external recipients. Microsoft 365 or Office 365 SMTP relay is similar to direct send except that it can send emails to external recipients.

Due to the added complexity of configuring a connector, direct send is recommended over Microsoft 365 or Office 365 SMTP relay, unless you must send emails to external recipients. To send emails using Microsoft 365 or Office 365 SMTP relay, your device or application server must have a static IP address or address range. You can't use SMTP relay to send emails directly to Microsoft 365 or Office 365 from a third-party hosted service, such as Microsoft Azure. For more information, see Troubleshoot outbound SMTP connectivity issues in Azure.

If you still need help to set up applications or devices sending emails using Microsoft 365 or you need help fixing issues with applications or devices sending emails using Microsoft 365, you can run an automated diagnostic.

If you happen to have an on-premises email server, you should seriously consider using that server for SMTP relay instead of Microsoft 365 or Office 365. A local email server that you have physical access to is much easier to configure for SMTP relay by devices and applications on your local network. The details about how to do this configuration are determined by your on-premises email server. For Exchange Server, see the following articles:

Any email apps you have setup will need to be configured with this login id and password, this includes mobile and desktop clients (MS Mail, MS Outlook). Visit O365/MFA Implementation FAQ for more information on how to set up your device.

All faculty, staff, and students have access to the full suite of Google and Microsoft 365 apps. Learn more about Google and Microsoft 365 on our website.Frequently Asked Questions:Checking email from your mobile device?